You can try the Logs Management tool, it shows the logs usage in terms of records and space occupied, as well as being able to clean the logs tables (sorry Ricardo ;) ). It also works in our personal platforms.

I checked the Logs Management tool but seems that it is supported from platform 9.1.0.20 and above. But we have a request from client who is on 9.0.1.15 version wanting to do the same logs clean up. Any advise what best can be done or any other tool which can be used?